Instantly launch a watt-controlled session on your indoor home trainer

BullWatt uses ERG mode, which automatically sets your resistance to a precise power target according to your cadence. This ensures a constant Watt effort and you are free to choose and change the Watt target.

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Easy & Simple Minimalist Design No loading No downloading No Ads No Registration

Your Training Density

This graph shows your training density for the last 365 days. The more you train, the more you will see the green squares.

Training Sessions

Setup Your FTP

Features

Precise Power Control

Maintain exact wattage targets with our advanced ERG mode that automatically adjusts resistance based on your cadence.

Lightning Fast

Get started instantly with no loading times. Our minimalistic design ensures you spend more time training and less time waiting.

Training sessions

We propose a catalog of structurized sessions to improve your workouts.

BullWatt Features Overview

Frequently Asked Questions

I was bored by long loading times in other apps. My goal was to create a fast way to launch an activity and record it. For me, a good session means working on wattage zones, which is why wattage control is the only option.

Click on Start, then click on Connect. You can adjust your power with buttons or key arrows (up, down, left, right). That's it! Don't forget to click on Stop to store the activity.

Bluetooth FTMS (Fitness Machine Service) is a Bluetooth profile that enables standardized communication between fitness equipment and apps for data exchange and control.

Functional Threshold Power (FTP) is the highest average power a cyclist can sustain for approximately one hour, measured in watts. It's a key metric used to gauge a rider's fitness, track progress, and establish personalized training zones.

You can find all your sessions stored in TCX format. The last sessions are registered in your browser; there is no server-side backup/save.

A computer with Google Chrome, a home trainer, or an exercise bike compatible with Bluetooth FTMS and with support for setting a target power (ERG mode = the resistance automatically changes based on your cadence to deliver constant wattage).

We use the same mechanism as YouTube to prevent sleeping. You need to keep the training tab visible. You can use the split-screen feature to watch YouTube or Netflix while training.

Check the requirements. If your device meets the requirements and still doesn't work, please contact us for assistance.

  • Domyos Challenge Bike

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